Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Growth performance of common carp, Cyprinus carpio fed varying lipid levels through low protein diet, with a note on carcass composition and digestive enzyme activity

100%

Manjappa K., Keshavanath P., Gangadhara B.

Acta Ichthyologica et Piscatoria

2002

tom 32

nr 2

Protein sparing by lipid has been demonstrated in certain cultivable species of fish. This study was carried out using four low protein isonitrogenous diets (24% crude protein) formulated by supplementing varied levels of fish oil (0, 3, 6, and 9%). The diets were fed for 120 days at 5% body weight to triplicate groups of common carp (av. wt. 2.13-2.21 g) stocked at 1 per m2 in mud bottomed cement tanks (18 m2), fertilized with poultry manure. The growth of fish was the highest (P < 0.05) with the diet containing 6% fish oil, followed by 3, 9, and 0%. Food conversion ratio and protein efficiency ratio improved with increasing dietary lipid level. Dietary lipid had a positive impact on carcass lipid level (P < 0.05). Moisture and crude protein did not vary (P > 0.05) from that of the control. Survival ranged from 96.29 (T1) to 100% (T0) without any significant (P > 0.05) difference among the treatments. While there was a general increase in amylase activity in the treated fish, protease activity showed a reduction with increase in oil supplementation. No difference (P > 0.05) in lipase activity was observed between the different treatments. The results indicate the beneficial effects of incorporating fish oil in the diet of common carp.

Growth response of Catla catla (Actinopterygii: Cypriniformes: Cyprinidae) to soya and maize supplemented traditional feed mixture

88%

Priyadarshini M., Manissery J. K., Gangadhara B., Rao L. M., Keshavanath P.

Acta Ichthyologica et Piscatoria

2011

tom 41

nr 3

Background. In Indian carp culture, a 1 : 1 mixture of rice bran and oil cake is traditionally used as feed in powder form; it is nutritionally inadequate and also a large part of it goes unutilized as the fish cannot feed on the powder effectively. With a view to improve its nutritional quality and reduce the wastage, the mixture was supplemented with soya and maize flours and converted into pellet form. The performance of the supplemented diets was evaluated by feeding them to catla, Catla catla, one of the popular Indian major carps. Materials and methods. Two test diets were formulated supplementing the feed mixture with soya flour (10% and 20%) and maize flour (39%), replacing equal quantities of rice bran and oilcake. These diets along with the control diet were fed to triplicate groups of catla fry maintained in outdoor cement tanks for 120 days. Results. The test diets enhanced growth and net fish production significantly (P < 0.05). This resulted in higher economic returns under the two test treatments. Survival of fish ranged from 74% to 76%. Carcass of fish receiving the test diets had significantly (P < 0.05) higher lipid and lower moisture levels. Digestive enzyme activity was affected positively (P < 0.05) by the test diets. Conclusion. Replacing rice bran and oilcake from the traditional feed mixture with soya and maize flours proved economically viable.

Ograniczanie wyników

2 Acta Ichthyologica et Piscatoria

2 Gangadhara B.

2 Keshavanath P.

1 Manissery J. K.

1 Manjappa K.

1 Priyadarshini M.

1 Rao L. M.

1 2011

1 2002

Wyniki wyszukiwania

Growth performance of common carp, Cyprinus carpio fed varying lipid levels through low protein diet, with a note on carcass composition and digestive enzyme activity

Growth response of Catla catla (Actinopterygii: Cypriniformes: Cyprinidae) to soya and maize supplemented traditional feed mixture